This paper investigates the concept of internalising disorders and the accompanying behaviour displayed in the schooling environment; looking at primary and secondary aged children with a diagnosis of Autism Spectrum Disorder (ASD). Through sourcing literature for the study, an extensive library was available for the research of externalising disorders, but limited resources were available for the research of internalising disorders. Through personal schooling and teaching experiences in the public sector of education, some identified gaps in the literature were addressed. A key finding in this inquiry is for teachers to understand the need for awareness of student needs, and to be on the lookout for identifying factors of possible disorders that could be causing behavioural issues exhibited, rather than deeming the child as “acting out”. Further research topics will be discussed to assist teachers to better understand internalising disorders and their impacts on the classroom environment.